Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39382587dc1a656966656b55f7fb6611de1f4b682f21b1d2de7f435a460ba221' 
  AND token = '1wlln+j2UrMaQvX8r+h1+rbXh2SuamU0VYPoI3623BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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