Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9179b7dc8fcc5cc524bb3f8adcc858ae24c087ea93632f479eb3440cd39c47a' 
  AND token = 'WaigPx04Ay/ddYGZcklB6SRexzrA2SYqKnbadMSrjn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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