Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea86c84cb48bd44b3071b0924da2679867770518db28dd74fb4ddb3e864318f' 
  AND token = 's75TcEv9+rdGytoxd6ZmVNCsJk106MhgyVA3j4FiQvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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