I presume that you are currently having a shared hosting service. In such case, the MySQL version should be provided in phpMyAdmin first page. There in the "Database server" section, "Server version" should show what MySQL version is currently being used.
As seen in the picture, your database server is MariaDB and not MySQL. In general, the shown 10.1.22-MariaDB version should be as MySQL 5.6 and 5.7 upgraded version, with some new features. As MariaDB homepage currently shows, the newest stable version of it is 10.3.8.
Well, for shared hosting services, the database version can also be provided in service details (if such section is created by your service provider) or in server "details" or "information" section on used control panel. However, it depends on the service provider and server configuration, so a better suggestion for you would be to check in phpMyAdmin.
If you have root access via SSH, you can try of using command "mysql -V" that should return the required information (of course, database has to be installed in the server).