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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '663710540f7cd78694060c5181f1d88e741ce0c1ba014ce8086bae44244b44d7' 
  AND token = 'xgD0KFt+mbtsYiKozaf4/UcogCfdKWZKv5bnN/YuoY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00802

JSON explain

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