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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7ab31bb81293442ffcfbd8a735a736d41503deefa70b76da13d57e21aa315738' 
  AND token = 'YUUQhrJat7igyuUhWk/i8YpCUEgd84j0LEzaWu2Olr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00853

JSON explain

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