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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6f1effb5e4f0ab27985c9502d4cbe16e48bf09905e7958971f444fca55cf838b' 
  AND token = 'iM0SLCzk9tgMS8eI21A56DlnJX+ilW5nPiNzBFak88E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00760

JSON explain

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