SELECT 
  cscart_products.*, 
  cscart_products.ebay_status, 
  cscart_products.ebay_template_id 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    22351, 22352, 22353, 22354, 22355, 22356, 
    22357, 22358, 22359, 22360, 22361, 
    22362, 22363, 22364, 22365, 22366
  )

Query time 0.00035

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 (22351,22352,22353,22354,22355,22356,22357,22358,22359,22360,22361,22362,22363,22364,22365,22366)"
    }
  }
}