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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c253871627bf57f7435ba01700b6ae26dcef8e68e1fb9d9c86b73c4422198392' 
  AND token = 'ZS0QQbpOt0G8fKl+poHaddAb0xnaRNuDq+JJDtEhAtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00905

JSON explain

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