Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e61fecdc05a3515ea1a847d303a0ebe44d3b5e46038a353aa541b836cf1d934' 
  AND token = 't4RzXdj/2C9fBmJwwuf6sRxYTTT8x+JvsDHuINgaGzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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