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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '19026403205fa6aaf5731a641be9184c724b3330f767ce260875a2e56e92667f' 
  AND token = '8CKCPzrjIV9nMhUyk3Rr5M8zMY8Uz6Q4KPta+MlXSNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00782

JSON explain

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