Titles, at the query stage, really don't matter. If I think you have a great title, hurray for us, we don't have to come up with a new one.
If I think your title could be better, I'll make some suggestions.
All of this of course is about as permanent as a summer sandcastle because the publisher has final control of the title. You love it, I love it, the editor loves it and B&N hates it: we're getting a new title.
That said, there are some things you should NOT use as book titles in a query:
Romeo and Juliet
To Kill a Mockingbird
Catcher in the Rye
In other words, don't use a title that is so very obviously associated with a great classic.
Sure, you can't copyright a title, so if you and Lee Child both decide to write a book called 61 HOURS it's hunky dory, but you really do NOT want to title your book something that's going to lead to obvious confusion. F for Phineas Flittergibbit isn't where most booksellers will direct buyers looking to buy Romeo and Juliet.