With version 1.3.2 of Execute SOQL, you can now pass in queries like these in your Flow and get back records:
SELECT LastName from Contact WHERE Id = '1123xxx333e3e'
Query on date literal:
SELECT Id from Contact WHERE CreatedDate = LAST_n_DAYS:14
Kudos to new contributor Ragan Walker, part of the impressive operation at Captech Consulting. Keep an eye out: I hear they’re about to post a crazy CSV utility.