SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e57d239d43cc4614a89a964654c2b87ddfa46037233f44fc165c732a6566a60' 
  AND token = '8gF369zcz+GsRP5wgXIt+OZ/qLQ0xJPsdwPVhXCjnCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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