Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc21516cdc9a6fdd320b605fc06cb303d14b09597100a6fbfe15dda8e70a8348' 
  AND token = 'byHRzGQm5ecMpgZGGAerh6GKiF5SiQGOk3JZGuFgugU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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