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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'dce33679be3109f4b40f315e5a7e5cedf666d12cbc0d0512eb320708a0b8ddc0' 
  AND token = '06p4X38CXO6MB2yVU0wylzDZ4tckTYu+XewkCttdzho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00834

JSON explain

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