Is it useful to practice intoxicated?
I would skip it, allow me to explain why.

Just a little bit of context:
Your question touches on a very important point about meditation currently many people see meditation as a simple tool for relaxation, some mix meditation with music, some use it for healthy benefits only, stress reduction etc... there is nothing wrong with that, however in Buddhism meditation is seen as something very different from that, much more powerful.

Meditation is something sacred, special, divine, that is why we prostate, that is why we are thankful for the opportunity to meditate, it is something that we should pay respect to, Buddha attained enlightenment meditating.

In a Nutshell, as a way of showing respect for the meditation process you should never do it after drinking, keep it as something pure, something special in your mind and in your routine.

PS: This is my approach, I understand people from other traditions may think differently