Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2c69b36e8ae3aa7ad5dc5f62a6bbf4b2c4f516a11f6952f7e34bf3fb88f993' 
  AND token = 'EYrcIaGz0QdeQeREuoWGviXc+AHZL8J6jv1iEATi5C4=' 
  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"
    }
  }
}