Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ab972d579ae451ff4d61b773bc0785631bdfefde5c878ed675f285df44b877' 
  AND token = 'cMHqbYdEzLrH36dpNS9ekaFuSIB1TDdXS25ngebF7Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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