SELECT 
  cscart_products.*, 
  cscart_products.ebay_status, 
  cscart_products.ebay_template_id 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    23599, 23600, 23601, 23602, 23603, 23604, 
    23605, 23606, 23607, 23608, 23609, 
    23610, 23611, 23612, 23613, 23614
  )

Query time 0.00032

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": 16,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (23599,23600,23601,23602,23603,23604,23605,23606,23607,23608,23609,23610,23611,23612,23613,23614)"
    }
  }
}