SELECT 
  cscart_abt__ut2_microdata.id, 
  cscart_abt__ut2_microdata.field, 
  cscart_abt__ut2_microdata_description.value 
FROM 
  cscart_abt__ut2_microdata 
  INNER JOIN cscart_abt__ut2_microdata_description ON cscart_abt__ut2_microdata_description.id = cscart_abt__ut2_microdata.id 
  AND cscart_abt__ut2_microdata_description.lang_code = 'ko' 
WHERE 
  cscart_abt__ut2_microdata.company_id = 0 
ORDER BY 
  cscart_abt__ut2_microdata.id ASC

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_abt__ut2_microdata",
      "access_type": "index",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["id"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "cscart_abt__ut2_microdata.company_id = 0"
    },
    "table": {
      "table_name": "cscart_abt__ut2_microdata_description",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["id", "lang_code"],
      "ref": ["devmotorsbay.cscart_abt__ut2_microdata.id", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "cscart_abt__ut2_microdata_description.lang_code = 'ko'"
    }
  }
}