SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    6723, 6722, 6724, 6712, 6725, 6726, 6727, 
    6728, 6729, 6731, 6732, 8742, 6734, 
    6735, 6736, 6737, 6738, 6739, 6741, 
    6742, 6748, 8801, 8802, 11103
  )

Query time 0.00099

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "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 (6723,6722,6724,6712,6725,6726,6727,6728,6729,6731,6732,8742,6734,6735,6736,6737,6738,6739,6741,6742,6748,8801,8802,11103)"
        }
      }
    ]
  }
}