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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127d4cedc2c798de02c63b8947895d8247bd2c1dbf504dd6d6a847338afa9289' 
  AND token = '1hoxNpGWs3i3uPE6OafJXmz+UuGdfm8hzh9tLC7YsUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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