SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'abbd7546458c58b37321e0de9de8b8d6f022c4bf71c4f51bb5c13c63eccc6093' 
  AND token = 'g4Ak2ORhknyNx0bAHH9PG9Ka1OKGQWveKpsWCYYzRZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00898

JSON explain

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