I can't tell you what a prospective employer will do but if the charge was dismissed, then it was dismissed. You weren't convicted of anything. There would be a record of the dismissed charge as well as the arrest but employers who use arrest records to deny employment are really taking legal chances. Such a policy can definitely run afoul of EEOC guidelines and some States flat-out prohibit using arrest records as the basis for denying employment.
I strongly suspect you're worrying over nothing.

