Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd639dfbfad8be9012c91edd95db8cf99fd6c60594a019f418e1a85f0610a0dfe' 
  AND token = 'L+T5DKNhHApjraGt0VBTRO0wufi/X8quPXLwkWWg5Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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