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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '55444b8a41241d5aece60bcee9aefeffce4c97a726405d2af6734214de1cd6c0' 
  AND token = 'asVzn7lmozc6qOtvMMKHe02pkXPS1J9wf/aUHRbi9pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00770

JSON explain

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