SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '85c1a29ef14b351e9589fb597829ddef010782af778b9793c4f80c72ade0134c' 
  AND token = 'ikZ9Csv59rOCiYdYuuuo54L7+ZmEMuBRKhDz5jzzIhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00926

JSON explain

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