SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0473cfd70410a0e37e7e82914edfd4bff610e17e86907033fdd628f528fba8a5' 
  AND token = 'xKOLh3WqVzzF1liiIYOlMu9f8zPJWMwSvcwDgvbrdyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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