I'm no expert by any means, but I just opened Lazarus to look at the DB drivers and they seem pretty respectable. The MySQL driver only goes up to 5.6 but works well in my experience. I haven't tried the SQLite, Postgres, ODB or MSSQL drivers though.
Also it does support 64 bit, I have a 64 bit Lazarus installed on my Windows VPS.
As MySQL develops, the bindings are updated as well, but most people will have to wait for stable release. If you use trunk, though, you can enjoy it right away because MySQL bindings has been designed rather easy to port a new version.
Also it does support 64 bit, I have a 64 bit Lazarus installed on my Windows VPS.