Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a0de8839ef37c8d227e8c9ad886ee48211dad9cdab1d6d8f9be71a9e5de370' 
  AND token = 'DkOi/PdozCl21vjTdAIpminGkKJMv3b1V++Cufd/l3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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