Here is the Missouri law that would apply for exceeding the limit by 20 or 25 MPH
Motorists to exercise highest degree of care--violation, penalty.
304.012. 1. Every person operating a motor vehicle on the roads and highways of this state shall drive the vehicle in a careful and prudent manner and at a rate of speed so as not to endanger the property of another or the life or limb of any person and shall exercise the highest degree of care.
2. Any person who violates the provisions of this section is guilty of a class B misdemeanor, unless an accident is involved then it shall be a class A misdemeanor
This is the same as reckless driving and yes, a driver's license can be temporarily suspended/revoked. That is a separate civil proceeding than the crime above
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