The contact area between the 4 tires and the concrete is maybe 100 square inches, and thus the car should exert no more than 40 psi at each tire. See:
It would appear from the strength maturity curve in this concrete reference that the concrete which is cured for 1 day should be very capable of supporting such a load:
Am I missing something here or can I drive and park my 4000 pound sedan on a 3 day old driveway and garage floor, despite "conventional wisdom" which states that a 2 week wait is appropriate.?