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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a4bb4faf723af091bc2776adc6246880e47a87c3ce4c96108ba79f1aa85a8735' 
  AND token = 'hYK2WMoQdSW1buH+1/PUeWb2Dt4zvkv0w1Szijao0l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00820

JSON explain

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