Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adff7795e3546e9354bac513f8dfff2a0edeea558f0b75c1a5cbe3b5ecba76ee' 
  AND token = 'o8ypBa2KjMFNMPCKhRAI9XJYNdsr+T7xGk5JieFLx90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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