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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '26094e7e144d47d61d0520fdb68968bfd30a331e7ec7ffd06fe57a98244cc0e5' 
  AND token = 'WejYEj8fXXG0nxQ4g8QWxVQMKhFak+kmH78Sius64Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00795

JSON explain

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