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 (251) 
  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, 96

Query time 0.00152

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.028615033,
    "filesort": {
      "sort_key": "descr1.product, products.product_id",
      "temporary_table": {
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "const",
              "possible_keys": ["PRIMARY", "c_status", "p_category_id"],
              "key": "PRIMARY",
              "key_length": "3",
              "used_key_parts": ["category_id"],
              "ref": ["const"],
              "rows": 1,
              "filtered": 100
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "ref",
              "possible_keys": ["PRIMARY", "pt"],
              "key": "PRIMARY",
              "key_length": "3",
              "used_key_parts": ["category_id"],
              "ref": ["const"],
              "loops": 1,
              "rows": 7,
              "cost": 0.00298901,
              "filtered": 100,
              "attached_condition": "products_categories.category_id <=> 251"
            }
          },
          {
            "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": 7,
              "rows": 1,
              "cost": 0.01199548,
              "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": 1.924850004,
              "rows": 1,
              "cost": 0.002540863,
              "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": 1.924850004,
              "rows": 1,
              "cost": 0.0032985,
              "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": 1.924850004,
              "rows": 1,
              "cost": 0.002692859,
              "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": 1.861163609,
              "rows": 1,
              "cost": 0.002614423,
              "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": 1.861163609,
              "rows": 1,
              "cost": 0.002483899,
              "filtered": 100,
              "attached_condition": "trigcond(tags.`status` = 'A' or tags.tag_id is null) and trigcond(trigcond(tags_links.tag_id is not null))"
            }
          }
        ]
      }
    }
  }
}