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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8b12941dacf97d1c2a7e66499e1f8d3f492d83c29409214116458e82430b5e03' 
  AND token = 'yqUveuydChOAd+B15hiNzt5mpWE1Q7iAa5SzhuS7yEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00750

JSON explain

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