Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4686f5f59b81340eca0f7695729305690b8dad2e01784572b6800a275aff7559' 
  AND token = 'PDBwrU3Uw+ImI5umJkqXY7sMkMlBFetOWmqf33yKLTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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