SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    394, 402, 129, 126, 147, 152, 1041, 818, 
    816, 66, 27, 28, 1159, 1160, 1158, 1164, 
    1165, 119, 120, 121, 731, 90, 82, 829, 
    1007, 1006, 1003, 1004, 1005, 108, 109, 
    110, 1318, 92, 80, 55, 140, 134, 350, 
    21, 91, 136, 135, 1228, 933, 1239, 70, 
    123
  )

Query time 0.00172

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 (394,402,129,126,147,152,1041,818,816,66,27,28,1159,1160,1158,1164,1165,119,120,121,731,90,82,829,1007,1006,1003,1004,1005,108,109,110,1318,92,80,55,140,134,350,21,91,136,135,1228,933,1239,70,123)"
    }
  }
}