Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0acfc6fbeb80bf2d01e761760bee2a5e5612845eda8adb03ddfecd29c40a63b' 
  AND token = 'Fsp6/35EfrxtZxFfROv12NcCa47BK7iUGFupS3xT0Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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