Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '521cf7fd0153cde98190d2c3ba9374da8a4c4177b07d66c4297ffc7f94331e23' 
  AND token = 'zcmtscICKy3HpeACVybwqXEcbJ1DB8P2yQiHNGclaW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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