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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6d1ea80148c538b29c4d9bc1081d49ed18baa394248cd75ef068e27b0352eb6d' 
  AND token = 'bKEZcvFatlKuZynsfEkptt01drE+HXSw3L12D9ZzQ4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00892

JSON explain

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