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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f605bd8f8e4633c8e0db7b48ea270b74d4f2cc8edc8426a98a61156f0debd5' 
  AND token = 'KrwWaaUy5SCrKjeuNv9FdqjMdh9NpizffH01GvsUoGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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