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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c6481e4b931fec0b4e7544089ef91b38a99f140d27841b4b5645abf54164d2ba' 
  AND token = 'RkfCj6b4u97fkp9n+Jxg1Y8rHIbrcardFZ/91TuWz14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00752

JSON explain

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