SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    2434, 1603, 1605, 1701, 1704, 1706, 1712, 
    1733, 1765, 2232, 2488, 1641
  )

Query time 0.00125

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 12,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (2434,1603,1605,1701,1704,1706,1712,1733,1765,2232,2488,1641)"
    }
  }
}