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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ccdd22630493c90de522dfc23afbab6f0ebf08ec24405dc62f9ceb3916e9c2ad' 
  AND token = 'JB7JDsOc82SeKCkNH7Yxn073UuC6VjmmOedfxGYd0dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00763

JSON explain

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