SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    5006, 4116, 4136, 4115, 4127, 4121, 4120, 
    4087, 4122, 4119, 4126, 4086, 4118, 
    4117, 4084, 5883, 4088
  )

Query time 0.00051

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": 17,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (5006,4116,4136,4115,4127,4121,4120,4087,4122,4119,4126,4086,4118,4117,4084,5883,4088)"
    }
  }
}