SELECT 
  cscart_profile_field_values.value_id, 
  cscart_profile_field_descriptions.description 
FROM 
  cscart_profile_field_values 
  LEFT JOIN cscart_profile_field_descriptions ON cscart_profile_field_descriptions.object_id = cscart_profile_field_values.value_id 
  AND cscart_profile_field_descriptions.object_type = 'V' 
  AND cscart_profile_field_descriptions.lang_code = 'en' 
WHERE 
  cscart_profile_field_values.field_id = 84 
ORDER BY 
  cscart_profile_field_values.position

Query time 0.00005

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "read_sorted_file": {
          "filesort": {
            "sort_key": "cscart_profile_field_values.position",
            "table": {
              "table_name": "cscart_profile_field_values",
              "access_type": "ALL",
              "rows": 46,
              "filtered": 100,
              "attached_condition": "cscart_profile_field_values.field_id = 84"
            }
          }
        }
      },
      {
        "table": {
          "table_name": "cscart_profile_field_descriptions",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "12",
          "used_key_parts": ["object_id", "object_type", "lang_code"],
          "ref": [
            "ebonza_cscart_test.cscart_profile_field_values.value_id",
            "const",
            "const"
          ],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond(cscart_profile_field_descriptions.object_type = 'V' and cscart_profile_field_descriptions.lang_code = 'en')"
        }
      }
    ]
  }
}