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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'afeed1db229be5fa53cc6b91a9bdd13160a58c448668f645534bc77071a64caf' 
  AND token = 'iANU19lWkllB/p86xSXf3ZFePKuQ8kYnRjB1yv3NbSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00793

JSON explain

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