Every conveyance of real estate made prior to January 1, 1943, by an executor or administrator of an estate pursuant to a decree of specific performance rendered by any county court of this state, as provided by section 30-13-12, without the entry of a subsequent order or judgment approving or confirming such conveyance, is hereby declared valid and of full force and effect if:
1. Such estate has been closed;
2. The executor or administrator has been discharged; and 3. The conveyance was legal.