SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d47432e66060b4fd5a311e01c46a4926195ff4c8af3da341a1d1f215c90b39' 
  AND token = '8fb+/bY7j3LpK+cfZpYk1QZx8XfueHYWJggsKIGS7Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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