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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1b44a3c9d68623cda7b911563c3fba0f91e3ecf44af5a78da4293c9ede5d3364' 
  AND token = 'YUupzaUbP88s2O3d9jAD0Tzzt7Vjj/4o1mmDcecCwxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00770

JSON explain

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