SELECT 
  * 
FROM 
  cscart_sg_services_technologies as st 
  LEFT JOIN cscart_sg_services_technologies_descriptions as std ON st.id = std.id 
  AND std.lang_code = 'en' 
Where 
  1 
  AND st.type = 'S' 
ORDER BY 
  st.position 
LIMIT 
  6

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.0222484,
    "nested_loop": [
      {
        "read_sorted_file": {
          "filesort": {
            "sort_key": "st.position",
            "table": {
              "table_name": "st",
              "access_type": "ALL",
              "loops": 1,
              "rows": 10,
              "cost": 0.0124848,
              "filtered": 100,
              "attached_condition": "st.`type` = 'S'"
            }
          }
        }
      },
      {
        "table": {
          "table_name": "std",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "10",
          "used_key_parts": ["id", "lang_code"],
          "ref": ["u985510652_ecartify_dev.st.id", "const"],
          "loops": 10,
          "rows": 1,
          "cost": 0.0097636,
          "filtered": 100,
          "attached_condition": "trigcond(std.lang_code = 'en')"
        }
      }
    ]
  }
}