SELECT 
  pd.product_id as product_id, 
  pd.product as product 
FROM 
  cscart_product_descriptions pd 
WHERE 
  1 
  AND pd.product_id = 347 
  AND pd.lang_code = 'vn'

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "pd",
          "access_type": "const",
          "possible_keys": ["PRIMARY", "product_id"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["product_id", "lang_code"],
          "ref": ["const", "const"],
          "rows": 1,
          "filtered": 100
        }
      }
    ]
  }
}