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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5166c21d6db205d0cda43d4df601f8e2a1e9dbd69f843d35dc2b9803bb664d8e' 
  AND token = '+ATz/c0Kai5tAs4UrX6OTZSRSVP3Es4GoICOlKcsKuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01545

JSON explain

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