Issue #3120946 by christophersmith262: Support prefixed databases.

src/Queue/KafkaQueue.php

@@ -286,7 +286,7 @@ SQL;
     $table = static::TABLE;
     $sql = <<<SQL
 SELECT deleted
-FROM {$table} q
+FROM {{$table}} q
 WHERE q.name = :name
 SQL;
     $deleted = $this->database