SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    878, 877, 879, 876, 870, 891, 869, 890, 
    871, 892, 277, 785, 784, 1081, 1079, 
    1080, 1078, 1082, 1083, 1077, 248, 919, 
    269, 821, 822, 278, 279, 302, 303, 720, 
    986, 921, 922, 920, 923, 960, 674, 679, 
    948, 678, 526, 677, 680, 527, 959, 676, 
    675, 896
  )

Query time 0.00179

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 (878,877,879,876,870,891,869,890,871,892,277,785,784,1081,1079,1080,1078,1082,1083,1077,248,919,269,821,822,278,279,302,303,720,986,921,922,920,923,960,674,679,948,678,526,677,680,527,959,676,675,896)"
    }
  }
}