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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2a300b6b2fafff4da91d3cfdf2d32d445e3a28c14a7bbee41d3db4a154989c36' 
  AND token = 'h4ItZUIci9e0hV7Z6efk4rZLg7gJb17NVdE5TSJ7X0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00800

JSON explain

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