Ok, even ignoring all armor that would mean that Ezreal would have to be doing somewhere around 2500 dps. Max attack speed is 2.5 meaning he has to be doing 1000 per hit. Assuming 100% crit and IE bonus that means Ezreal has to have around 400 ad.
So to wrap all this up, Ezreal's stats would have to be: ~150% attack speed, 100% crit, ~300 bonus ad.
So even assuming you are just taking true damage this is likely beyond the realm of possibility, but when you consider that with even 100 armor (which you would certainly have at 230 even with arpen options) you would need another FOUR HUNDRED AD to make this math work it becomes obviously impossible.
So in short this did not really happen.