SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    251, 252, 253, 254, 256, 257, 258, 259, 
    260, 261, 262, 263, 264, 265, 266, 267, 
    268, 269, 270, 271, 272, 273, 274, 275, 
    276, 277, 278, 279, 280, 281, 282, 283, 
    284, 285, 286, 287, 288, 289, 290, 291, 
    292, 293, 294, 295, 296, 298, 299, 300
  )

Query time 0.00178

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": 48,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (251,252,253,254,256,257,258,259,260,261,262,263,264,265,266,267,268,269,270,271,272,273,274,275,276,277,278,279,280,281,282,283,284,285,286,287,288,289,290,291,292,293,294,295,296,298,299,300)"
    }
  }
}