SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924107ff593cf03acf4e987c518990f2361583746fa61e652679882fa2bddd98' 
  AND token = '0hh1Ik3GWqf89oTOiyAowC4l6/c+dVJrdYQz+bTZ6Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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