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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7fd48a53a04d6e8b9a833a9c03752a98ad28a8e5e1549a767c81c7a32b531977' 
  AND token = 'oKVbLXF25QekCwmBS5rQPm40mh8rjXDxtCo9Ayn0+Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00928

JSON explain

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