Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb96be66df7d97024f5f23913df743bca2e212cec8edd49eeabcd473ee7c545' 
  AND token = 'hX6F8/ECtuk+cbr0vfFgDmsVgsXmeck/MLB4T3/ASNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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