Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b34c36687c1b556286da4762cb961fa4392ea6750f0ab316bee01f18171428' 
  AND token = 'XgJwbzVT07AbKOItkHDmNEwfCI7u7yUYLqzYIY9aiTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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