Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '34ab79a9bf423554089ae5c0ef54234282e951a90abcef4c02220fcdba7aa86f' 
  AND token = '102IWrGcy6NMzJ1g+1ZVqgL1Srx4bxYTCye6NTv03IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00782

JSON explain

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