How do you tell a possible employer that you’re willing to leave you’re current job without notice to start asap

I have an interview this week at a company that I really want to get in with. My current job is draining and has had a huge impact on my mental health and I want to lease asap. I’d like to start with them immediately if they are down, but also don’t want to raise a red flag that I’m the type that quits without notice (I’ve always given notice at previous jobs). Any advice? Should I just wait for 2 weeks?