Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35b656f447bc9cb77e8ad112a393040ffc5426b65312b1bff8d71943ffeed06' 
  AND token = 'z1MReoy17YK/aqt7u9SEQybrv/Gv0MQ5l+LSJHRy930=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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