Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87232a2d6113404022a17999707939c0df4a7de0fb09d485b3a672d6f586dbc8' 
  AND token = '7Y8UFmRkxMiP+t5HFrfqfNZ06Trgl2ZGB75hrfopIkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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