SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    1620, 79, 1619, 1592, 1617, 1616, 1614, 
    1576, 1613, 1612, 1611, 1490, 1610, 
    1609, 1608, 1607, 1606, 1605, 1560, 
    1550, 1548, 1547, 1513, 1604
  )

Query time 0.00121

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 (1620,79,1619,1592,1617,1616,1614,1576,1613,1612,1611,1490,1610,1609,1608,1607,1606,1605,1560,1550,1548,1547,1513,1604)"
    }
  }
}