Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2267f959f2c6f52a8fe5764046cae149096c35930521a8e1736fc28b1c6be168' 
  AND token = 'bKhkwBrD0s1bXgeFZ2sfu0CPsFRemeGNIAC1GZ6n6bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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