The login for MySQL on a server running Plesk is the following:
user: admin
password: the plesk admin password. You can find out how to get that at the following:
ZEC: | t1NQp1UuqQbmnXzazbLTSreS2AbaZpRBuTM |
LTC: | LZyNF1qkBUA7XFz83m5xwzGgmmj1owQn9d |
BTC: | 1PY95KFPTEJTR7f2NnSgaB6xB9pwDJkcJz |