Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81993599d87c9e21957c5aa81560d28e86ef3680aeb796540cded135d3686b51' 
  AND token = 'MaKtWbDjH8T8gg9qQ3XKUhggL4sy8qNAHu/PadwTRNo=' 
  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"
    }
  }
}