Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8009e816d4acdb05463ceba8ab95841cc3d99e67f5478fbd31dc016fca868b3b' 
  AND token = 'WndkmtMXb2cZBTvN7JcYrvqrboNKUbCHnyhzjHHut78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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