Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4f33232923c93b9f048b9df3208ecf233e03addba6be72ec476e6b57c9d2a2' 
  AND token = 'pBKYbvyoLtKniSx1AdbH8e/DANiHwDgPY0MsjWTRs/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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