It's a run-on sentence. It should be two sentences or two independent clauses separated by a semi-colon.
Come when you like; I can see you any time.
With the imperative (Come when you like) I would use only the present can.
I would not mix the tentativeness of could with the openness of any time.
I find the following sentence more in keeping with the idea of could see you. Note that there is a restriction here -- a condition. (This is the so-called Second Conditional.)
I could see you tomorrow if you came before noon.
CJ