If you wish to enable access to MySQL databases from remote networks, then in addition to the LocalNetworkingOnly db setting mentioned above, you will need to execute the following commands:
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config set mysqld service access public status enabled TCPPort 3306
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signal-event remoteaccess-update
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signal-event reboot
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Keep in mind this enables access to your MySQL database for ANYONE, so make sure you have strong passwords on ALL your MySQL databases.
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Alternatively it would be a more secure approach to require external (remote) users to establish a VPN connection and effectively become part of the local network. In that case do not change the mysql access to public status using the above command.