Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8ba83c1f2f3f84830d4ee554197b41e17eb65b92c6a5313b3b12df9813a9e34b' 
  AND token = 'cYFGyXcczz5ZUeG6TzLrlOa7YaqLd0ww02qmCjrs2gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00855

JSON explain

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