Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63dc051ebd35e70225d39f2694607d2dd6ad9114787bd768da3e810dd0926fa9' 
  AND token = 'D9Nyt3Jc/lzUkLLCcoQIyzzEksvjoFOTuCe38d5XBF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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