SELECT 
  tmall_profile_fields.*, 
  tmall_profile_field_descriptions.description, 
  tmall_profile_fields.profile_required as required 
FROM 
  tmall_profile_fields 
  LEFT JOIN tmall_profile_field_descriptions ON tmall_profile_field_descriptions.object_id = tmall_profile_fields.field_id 
  AND tmall_profile_field_descriptions.object_type = 'F' 
  AND lang_code = 'en' 
WHERE 
  1 = 1 
  AND tmall_profile_fields.profile_type = 'S' 
  AND tmall_profile_fields.profile_show = 'Y' 
ORDER BY 
  tmall_profile_fields.position

Query time 0.00817

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.051850091,
    "nested_loop": [
      {
        "read_sorted_file": {
          "filesort": {
            "sort_key": "tmall_profile_fields.position",
            "table": {
              "table_name": "tmall_profile_fields",
              "access_type": "ALL",
              "possible_keys": ["profile_show"],
              "loops": 1,
              "rows": 39,
              "cost": 0.016135395,
              "filtered": 38.46154022,
              "attached_condition": "tmall_profile_fields.profile_type = 'S' and tmall_profile_fields.profile_show = 'Y'"
            }
          }
        }
      },
      {
        "table": {
          "table_name": "tmall_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": ["tmall.tmall_profile_fields.field_id", "const", "const"],
          "loops": 15,
          "rows": 1,
          "cost": 0.02614019,
          "filtered": 100,
          "attached_condition": "trigcond(tmall_profile_field_descriptions.object_type = 'F' and tmall_profile_field_descriptions.lang_code = 'en')"
        }
      }
    ]
  }
}