SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb6dfe8cc3a5a58d9237a0245586bb32452b6d56fec39377f51506eadaf0a62' 
  AND token = 'hGEJkwJ6q+AI4U8n/7xWXQbFsnMGuYUf+FP0l7kWGJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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