SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    397, 511, 1023, 1022, 847, 525, 577, 576, 
    658, 659, 932, 656, 657, 376, 540, 592, 
    1015, 767, 1088, 572, 619, 355, 342, 
    547
  )

Query time 0.00115

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": 24,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (397,511,1023,1022,847,525,577,576,658,659,932,656,657,376,540,592,1015,767,1088,572,619,355,342,547)"
    }
  }
}