SELECT 
  cd.city 
FROM 
  cscart_cities AS c 
  INNER JOIN cscart_city_descriptions AS cd ON cd.city_id = c.city_id 
  AND cd.lang_code = 'vn' 
WHERE 
  c.code = '27058' 
  AND c.status = 'A' 
  AND c.state_code = '79' 
  AND c.country_code = 'VN' 
LIMIT 
  1

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "c",
          "access_type": "const",
          "possible_keys": ["PRIMARY", "cs", "state_code", "code", "country_code"],
          "key": "cs",
          "key_length": "204",
          "used_key_parts": ["country_code", "state_code", "code"],
          "ref": ["const", "const", "const"],
          "rows": 1,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "cd",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["city_id", "lang_code"],
          "ref": ["const", "const"],
          "rows": 1,
          "filtered": 100
        }
      }
    ]
  }
}