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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b69296fd5c62423eb05d21bd48bb825eb391a973cf6eb9aa02cbdc2d4095c963' 
  AND token = 'QFyFAV8QWqYpie7iunrDbL5B89BhLALjcdI/k3ElLvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00910

JSON explain

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