Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c0281752514ae221b9ef0c12122d9d21d5df9790c3a5817bce7a79dbe11313' 
  AND token = 'pDY1d3/nIfCKYLv0g5O8tV9UapEQZCvlzDfrr60v4ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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