Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbdc3fa1d5383aa56d0d728abc9af4b427a9b30cdb87b9ab71d9d76374bea16f' 
  AND token = '0HJrERP4m3MjYO6tA4C6jfck3BYkJZjnCt4U99iua1A=' 
  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"
    }
  }
}