Any of the sites that show the public CT logs such as this one.
https://tools.letsdebug.net/cert-search?m=domain&q=panel.melonhost.cz&d=168
Although, sometimes they are slow to show the latest one. In your case there was another one issued on December 13th which I can see using a tool that requires a subscription. But once your December 11th certificate is older than 168 hours you should be able to get another cert