Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc026c01f8632a0edd51cd92115f084d4d9dfd5d082ad321f37e9529768c1cf' 
  AND token = '07yItOcZfHVLk0v5fH6A5IS7wVfUgxMEn6DSXj/qK94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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