SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  descr1.product as product, 
  companies.company as company_name, 
  products.product_type, 
  products.parent_product_id, 
  descr1.full_description as full_description, 
  descr1.short_description as short_description, 
  GROUP_CONCAT(
    DISTINCT tags.tag 
    ORDER BY 
      tags.tag SEPARATOR ', '
  ) AS tags 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  LEFT JOIN cscart_tag_links AS tags_links ON tags_links.object_id = products.product_id 
  AND tags_links.object_type = 'P' 
  LEFT JOIN cscart_tags AS tags ON tags.tag_id = tags_links.tag_id 
WHERE 
  1 
  AND cscart_categories.category_id IN (245, 246, 247, 248, 249) 
  AND companies.status IN ('A') 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND products.parent_product_id = 0 
  AND (
    tags.status = 'A' 
    OR tags.tag_id IS NULL
  ) 
  AND products.product_type != 'D' 
GROUP BY 
  products.product_id, 
  products.product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  0, 12

Query time 0.00271

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.294181137,
    "filesort": {
      "sort_key": "descr1.product, products.product_id",
      "temporary_table": {
        "filesort": {
          "sort_key": "products.product_id",
          "temporary_table": {
            "nested_loop": [
              {
                "table": {
                  "table_name": "cscart_categories",
                  "access_type": "range",
                  "possible_keys": ["PRIMARY", "c_status", "p_category_id"],
                  "key": "PRIMARY",
                  "key_length": "3",
                  "used_key_parts": ["category_id"],
                  "loops": 1,
                  "rows": 5,
                  "cost": 0.00948507,
                  "filtered": 100,
                  "attached_condition": "cscart_categories.category_id in (245,246,247,248,249) and (cscart_categories.usergroup_ids = '' or find_in_set(0,cscart_categories.usergroup_ids) or find_in_set(1,cscart_categories.usergroup_ids)) and cscart_categories.`status` in ('A','H') and cscart_categories.storefront_id in (0,1)"
                }
              },
              {
                "table": {
                  "table_name": "products_categories",
                  "access_type": "ref",
                  "possible_keys": ["PRIMARY", "pt"],
                  "key": "PRIMARY",
                  "key_length": "3",
                  "used_key_parts": ["category_id"],
                  "ref": ["u985510652_ecartify_dev.cscart_categories.category_id"],
                  "loops": 5,
                  "rows": 20,
                  "cost": 0.02276545,
                  "filtered": 100
                }
              },
              {
                "table": {
                  "table_name": "products",
                  "access_type": "eq_ref",
                  "possible_keys": ["PRIMARY", "status", "idx_parent_product_id"],
                  "key": "PRIMARY",
                  "key_length": "3",
                  "used_key_parts": ["product_id"],
                  "ref": ["u985510652_ecartify_dev.products_categories.product_id"],
                  "loops": 100,
                  "rows": 1,
                  "cost": 0.1107432,
                  "filtered": 27.49785805,
                  "attached_condition": "products.parent_product_id = 0 and (products.usergroup_ids = '' or find_in_set(0,products.usergroup_ids) or find_in_set(1,products.usergroup_ids)) and products.`status` = 'A' and products.product_type <> 'D'"
                }
              },
              {
                "table": {
                  "table_name": "companies",
                  "access_type": "eq_ref",
                  "possible_keys": ["PRIMARY"],
                  "key": "PRIMARY",
                  "key_length": "4",
                  "used_key_parts": ["company_id"],
                  "ref": ["u985510652_ecartify_dev.products.company_id"],
                  "loops": 27.4978572,
                  "rows": 1,
                  "cost": 0.025414383,
                  "filtered": 100,
                  "attached_condition": "companies.`status` = 'A'"
                }
              },
              {
                "table": {
                  "table_name": "descr1",
                  "access_type": "eq_ref",
                  "possible_keys": ["PRIMARY", "product_id"],
                  "key": "PRIMARY",
                  "key_length": "9",
                  "used_key_parts": ["product_id", "lang_code"],
                  "ref": [
                    "u985510652_ecartify_dev.products_categories.product_id",
                    "const"
                  ],
                  "loops": 27.4978572,
                  "rows": 1,
                  "cost": 0.047121428,
                  "filtered": 100,
                  "attached_condition": "trigcond(descr1.lang_code = 'en')"
                }
              },
              {
                "table": {
                  "table_name": "prices",
                  "access_type": "ref",
                  "possible_keys": [
                    "usergroup",
                    "product_id",
                    "lower_limit",
                    "usergroup_id"
                  ],
                  "key": "product_id",
                  "key_length": "3",
                  "used_key_parts": ["product_id"],
                  "ref": ["u985510652_ecartify_dev.products_categories.product_id"],
                  "loops": 27.4978572,
                  "rows": 1,
                  "cost": 0.027585752,
                  "filtered": 96.69136047,
                  "attached_condition": "prices.lower_limit = 1 and prices.usergroup_id in (0,0,1)",
                  "using_index": true
                }
              },
              {
                "table": {
                  "table_name": "tags_links",
                  "access_type": "ref",
                  "possible_keys": ["PRIMARY"],
                  "key": "PRIMARY",
                  "key_length": "6",
                  "used_key_parts": ["object_type", "object_id"],
                  "ref": [
                    "const",
                    "u985510652_ecartify_dev.products_categories.product_id"
                  ],
                  "loops": 26.58805155,
                  "rows": 1,
                  "cost": 0.026465237,
                  "filtered": 100,
                  "attached_condition": "trigcond(tags_links.object_type = 'P')"
                }
              },
              {
                "table": {
                  "table_name": "tags",
                  "access_type": "eq_ref",
                  "possible_keys": ["PRIMARY"],
                  "key": "PRIMARY",
                  "key_length": "3",
                  "used_key_parts": ["tag_id"],
                  "ref": ["u985510652_ecartify_dev.tags_links.tag_id"],
                  "loops": 26.58805155,
                  "rows": 1,
                  "cost": 0.024600617,
                  "filtered": 100,
                  "attached_condition": "trigcond(tags.`status` = 'A' or tags.tag_id is null) and trigcond(trigcond(tags_links.tag_id is not null))"
                }
              }
            ]
          }
        }
      }
    }
  }
}