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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8522ea343fabadf1c6f74a24313782e4d152e30dc53de029ad487bc0d961d8f8' 
  AND token = 'HzNh91ZQO88IOuCZzxqGRwLzxWzwqbYyQboA8T66xYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00793

JSON explain

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