I actually think this would be a really bad idea- it's nothing to do with the quality of the text or whether it's a good book or not. This is an interview which isn't far removed from a job interview- if your goal is to get in, I'd go for a safer choice.
Firstly, I'd go for a KS3/4 choice. That's where the bulk of your teaching (especially during the PGCE) is likely to be. IMO, your interview would be stronger if you could talk about a book that might engage more reluctant readers, rather than talking about something that would engage sixth formers. Putting it nicely, engaging sixth formers is easy- engaging bottom set Year 9 on a Friday afternoon is where the real challenge is. What sort of book might appeal to them and also teach them something about language? Show that you understand the challenges of the job!
Secondly, to some interviewers, I do think talking about Lolita would show a lack of judgement. Not everyone has the same opinion on the book, and in general it's best to avoid really polarizing subject matter in interview. Your interviewers might be fine with it, but why take that risk.
Thirdly, grooming is a hot safeguarding topic at the moment. If you brought up a book that arguably glamorizes grooming, you're more likely to face difficult questions from the interviewers.
If you do decide to go ahead with talking about Lolita, then I'd prepare some answers for difficult questions such as:
-How would you deal with teaching this book if there was a student who had previously been sexually assaulted or groomed in the class?
-How would you deal with it if a student said the subject matter of the book made them uncomfortable? (Telling them to get over it, particularly as a male teacher to a female student, wouldn't be an acceptable answer).
-How would you deal with it if a parent was uncomfortable with their child studying this book?
-Given the subject matter, what can this book teach students about literature that another book wouldn't be able to do?
I'm not saying we shouldn't teach controversial things in school- as a biology teacher I get the fun of teaching teenagers all about their own anatomy, hormones and hormonal contraception- but in an interview it's not necessarily about being true to your authentic self, or whatever. It's about showcasing yourself in the best possible light.