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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6ba1eb18b92ad176feeee5c53540fc101a195453e21b69b1ba753200a582c930' 
  AND token = 'lxVnQ1m9XLzfJTkrqGHi9dx4khL36IylpAmWD782RfA=' 
  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"
    }
  }
}