Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8a0d231ff123183e5a49b2c5b8d8edf45d3e7e1fbc21fba3cbb9cf856b027c' 
  AND token = 'nxXepYJOd8kdabPfmtbWRYAzygXGDxHsFEWtj0wCfA8=' 
  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"
    }
  }
}