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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1dc1b21fe19aacdb8081fffca86db930e0c47b87b446c5fb6ee9b82e8547dca8' 
  AND token = 'IILUBPBf2JXJxaQPnaYEZJgSMn0ptEoxiRmOXFFgDo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00773

JSON explain

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