Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c838846ed7c257e3591a45adb1e36df31df12c57ecaac1bfdef34aa642e7f88' 
  AND token = 'E7i/eY39HKVpz2bmEX0MQPuXxpD2XKF2egOhfDb6Lzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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