SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b316b18f7956428286e72f5b36a04c6f3579b310c71222c8e637c88bb995d64' 
  AND token = 'GVvmsy6zkh4j6KuuYiIDZU3+C+ngo+QZ0PgNE6kf7PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}