Ideal op amp inputs have infinite input impedance. Ideal oscilloscopes are like that too. Practical/real versions of these may have relatively large input impedance when compared with whatever source impedance we have connected. But then again....in some cases where the input impedance is not relatively large.....then it can be a matter for consideration. In your case the oscilloscope won't load down your op-amp much. Not much at all.
No kidding. Well , that was enlightening...
What is an "ideal oscilloscope" ?
I'm not familiar with that one.