Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fbd70f7d3b4c35f49636d83af3e84a37e7ba41bec0b9532ce027911d0d4ab28' 
  AND token = 'TYzXSJLd31Pvb1R7RzI6uQBNOS2eIhROj8t4ZS42pHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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