Yep, enzymes are dead. But don't dump! Depending on how fast your burner heats, you may have had some enzymatic activity before it got to 170 (which is the temp all enzyme activity is dead)
I have seen experiments where people got full conversion in as little as 10 minutes.
At least sparge and take a reading and see if you got any fermentables. Maybe you'll just end up with terrible efficiency and you can call it a session stout. I mean you already paid for the ingredients right? What harm will it do by letting it ride and seeing if you still make beer?