SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9dfb0981814b5fda7e60777d675e9af4f24697b525970f0677c4e69877c5f1' 
  AND token = 'eObd+PJXjRw01vWSKhZfSJG9QvpCbHXF+PV0BICfV6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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