Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412e516beeea678099fed09942e43e5aa9cd07b7319bc0b56fe21e4ac718cc09' 
  AND token = 'mrlshUGYtzn7pJhgFfyNJH853vf/AVmSMu3vf8oSQeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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