Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '791d87ceed7808fcaee37c9d830e4b9d8997a02c0ccfbbb255e17563ff15226f' 
  AND token = '09M2xAXnx57jIxhwUZzTsW3yiOEigczGuyCm9AZqg7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00899

JSON explain

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