Hosting offer MySQL version 5.5.30..... Latest version is 5.7 !! and many apps require 5.5.31 as minimum.
Please Upgrade it (or instruct how to do it myself)
Plesk doesn’t ship MySQL, it only downloads it from original OS vendor repo and it is quite likely it may be outdated there.
To solve your issue, please contact your hosting provider (the company that hosts your website) and request support from them directly. We are the authors of the software you and your hosting provider are using, and unfortunately, we cannot help with this particular request because we do not host your website.
We are closing your request as it doesn’t include any software improvement proposal.