SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    1640, 1641, 1642, 1643, 1645, 1646, 1647, 
    1324, 1650, 1651, 1652, 1653
  )

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": 12,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (1640,1641,1642,1643,1645,1646,1647,1324,1650,1651,1652,1653)"
    }
  }
}