SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    439177, 437268, 442349, 405994, 413775, 
    421121, 449116, 415507, 430647, 452052, 
    445229, 452721
  )

Query time 0.00038

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 (439177,437268,442349,405994,413775,421121,449116,415507,430647,452052,445229,452721)"
        }
      }
    ]
  }
}