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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4c8e8db700542893de4c6dcb7c92f186e132cc3277247734e4fa3dbb427f72' 
  AND token = 'wt69b5l00N0zDI6bJw6jZN4iUAun8acnr2qzbA7Zu/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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