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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'bda557f6224b74093954659a3528379f8871af18cd3abc8c57d450ed0971b704' 
  AND token = 'sMVB14U90TqrUy5IreGKvAKeXGt7Qase6rVuDHlbMXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00895

JSON explain

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