Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a3d36bca88dfd255f5cb1897247d1165607a11d72013c34913307e7818f07c' 
  AND token = 'knu344WFKWfvm9GKzZFBci9jWbJ1/7xRM0Ew2otztFI=' 
  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"
    }
  }
}