I have panda cories... and a 54L is the smallest tank I would suggest for them, so I'd say yes, but only a group of 6. And a trio of male guppies would work, with that stocking as well... That would be fully stocked (and maybe a bit over), so you'll need to keep up on the water changes...
Also, nothing can be added until the tank is fully cycled. Pandas can be more sensitive than some of the other cories, so be sure that the tank is COMPLETELY cycled plus a few weeks to ensure that they will be safe.