SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    447321, 427728, 429522, 401174, 414674, 
    437251, 415838, 412826, 449270, 451598, 
    402248, 457520
  )

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.0216566,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "loops": 1,
          "rows": 12,
          "cost": 0.0216566,
          "filtered": 100,
          "attached_condition": "cscart_products.product_id in (447321,427728,429522,401174,414674,437251,415838,412826,449270,451598,402248,457520)"
        }
      }
    ]
  }
}