I wanted to lol
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It move 414 px in one frame, which is 1/30th of a second. The missile is 250 px long. If I assume a length of 7.5m, the missile is moving 12.42 m in 1/30th second, which translates to a speed of ...wait for it....372.6 m/s or Mach 1.1
The unknown here is missile length: if I assume 6 m, then the speed is 0.87 Mach, if I assume 9 m, then the speed is 1.3 Mach.
The video could also be 60 fps (slowed down), in that case the speed would be doubled, but the video looks normal speed.
I think this near Mach 1 number is supported by this picture here which seems to show the shockwave crashing on the ground as the missile hits. The shockwave looks rounded and not sharp as you would have expected for high supersonic.
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