Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15970479f05220dbc0cafc0eced66796d7af9eb9fef99d8ff40256938da182ee' 
  AND token = 'R5zH7Wot7GIB2yXI0mlju9EYu8sO0PkCHKbLaitjPOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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