In my experience, they won't learn and you need to get out.

I've been in this situation before, with a team that was ridiculously over performing and management that just couldn't stop pouring the pressure on. It didn't end well with the company shooting itself in the foot by creating a turnover problem at a crucial moment. The loss of those engineers sunk a successful product. Even the CTO, who was one of the cofounders left.

In your case, I suggest you give them the best dog and pony show you can. Mention a few big successes that almost didn't get made, and show overall positivity. Be honest and tell them their expectations are unrealistic but demonstrate an interest in trying your hardest. Then I'd try until you find something else asap.