How to check validity of CRM Key in the database (On Premise)

I have upgraded the CRM instance from CRM 2013 to CRM 2015 but with the trial key which was for 90 days.

Later I got the purchased the Valid key and changed the Product key of the organization from the Deployment Manager  but there was no prompt at the time of applying the product key.

So I checked in the database MSCRM_CONFIG and found the key in the ConfigSettingsProperties table in the row LicenseKeyV8RTM but even then I was not able to find the validity of this product key or when it will expire.

Any suggestions on how I will be able to do that .