SELECT 
  cscart_products.*, 
  cscart_products.ebay_status, 
  cscart_products.ebay_template_id 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10818, 10820, 10821, 10822, 10825, 10828, 
    10829, 10831, 10836, 10839, 10841, 
    10849, 10851, 10855, 10864, 10867
  )

Query time 0.00048

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 (10818,10820,10821,10822,10825,10828,10829,10831,10836,10839,10841,10849,10851,10855,10864,10867)"
    }
  }
}