Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95c4b6e73c65b73a322face0bf9f7291d2b759a405b56bbb8374975fb7a0253' 
  AND token = 'RGubaCDwDcpdi5kPF1v8QvMZRT0fUbksi9ujAAuL9+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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